參數(shù)資料
型號: 935263704557
廠商: NXP SEMICONDUCTORS
元件分類: 接收器
英文描述: AM/FM, AUDIO DEMODULATOR, PQFP44
封裝: PLASTIC, QFP-44
文件頁數(shù): 34/71頁
文件大小: 304K
代理商: 935263704557
2000 Aug 04
4
Philips Semiconductors
Product specication
Digital TV sound demodulator/decoder
TDA9874A
2.1.1
ANALOG 2-CARRIER SYSTEMS
Table 1
Frequency modulation
Table 2
Identication for A2 systems
2.1.2
2-CARRIER SYSTEMS WITH NICAM
Table 3
NICAM
Notes
1. See
“EBU NICAM 728 specification” or equivalent specification.
2. Not yet officially defined.
STANDARD
SOUND
SYSTEM
CARRIER
FREQUENCY
(MHz)
FM DEVIATION (kHz)
MODULATION
BANDWIDTH/
DE-EMPHASIS
(kHz/
s)
NOM.
MAX.
OVER.
SC1
SC2
M
mono
4.5
15
25
50
mono
15/75
M
A2
4.5/4.724
15
25
50
1
2(L + R)
1
2(L R)
15/75 (Korea)
B/G
A2
5.5/5.742
27
50
80
1
2(L + R)
R
15/50
I
mono
6.0
27
50
80
mono
15/50
D/K (2)
A2
6.5/6.742
27
50
80
1
2(L + R)
R
15/50
D/K (1)
A2
6.5/6.258
27
50
80
1
2(L + R)
R
15/50
D/K (3)
A2
6.5/5.742
27
50
80
1
2(L + R)
R
15/50
PARAMETER
A2; A2*
A2+ (KOREA)
Pilot frequency
54.6875 kHz = 3.5
× line frequency
55.0699 kHz = 3.5
× line frequency
Stereo identication frequency
Dual identication frequency
AM modulation depth
50%
STANDARD
SC1
SC2
(MHz)
NICAM
DE-EMPHASIS
ROLL-
OFF (%)
NICAM
CODING
FREQUENCY
(MHz)
TYPE
MODULATION
INDEX (%)
DEVIATION
(kHz)
NOM
.
MAX
.
NOM
.
MAX
.
B/G
5.5
FM
27
50
5.85
J17
40
note 1
I
6.0
FM
27
50
6.552
J17
100
note 1
D/K
6.5
FM
27
50
5.85
J17
40
note 2
L
6.5
AM
54
100
5.85
J17
40
note 1
117.5 Hz
line frequency
133
---------------------------------------
=
149.9 Hz
line frequency
105
---------------------------------------
=
274.1 Hz
line frequency
57
---------------------------------------
=
276.0 Hz
line frequency
57
---------------------------------------
=
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